Check in the thirdparty libs needed for webkitpy.

Tools/Scripts/webkitpy/thirdparty/unittest2/signals.py

Index: Tools/Scripts/webkitpy/thirdparty/unittest2/signals.py
diff --git a/Tools/Scripts/webkitpy/thirdparty/unittest2/signals.py b/Tools/Scripts/webkitpy/thirdparty/unittest2/signals.py
new file mode 100644
index 0000000000000000000000000000000000000000..e40328dea7a919ba7d6b5969e9ca5cf74d69178f
--- /dev/null
+++ b/Tools/Scripts/webkitpy/thirdparty/unittest2/signals.py
@@ -0,0 +1,57 @@
+import signal
+import weakref
+
+from unittest2.compatibility import wraps
+
+__unittest = True
+
+
+class _InterruptHandler(object):
+    def __init__(self, default_handler):
+        self.called = False
+        self.default_handler = default_handler
+
+    def __call__(self, signum, frame):
+        installed_handler = signal.getsignal(signal.SIGINT)
+        if installed_handler is not self:
+            # if we aren't the installed handler, then delegate immediately
+            # to the default handler
+            self.default_handler(signum, frame)
+            
+        if self.called:
+            self.default_handler(signum, frame)
+        self.called = True
+        for result in _results.keys():
+            result.stop()
+
+_results = weakref.WeakKeyDictionary()
+def registerResult(result):
+    _results[result] = 1
+
+def removeResult(result):
+    return bool(_results.pop(result, None))
+
+_interrupt_handler = None
+def installHandler():
+    global _interrupt_handler
+    if _interrupt_handler is None:
+        default_handler = signal.getsignal(signal.SIGINT)
+        _interrupt_handler = _InterruptHandler(default_handler)
+        signal.signal(signal.SIGINT, _interrupt_handler)
+
+
+def removeHandler(method=None):
+    if method is not None:
+        @wraps(method)
+        def inner(*args, **kwargs):
+            initial = signal.getsignal(signal.SIGINT)
+            removeHandler()
+            try:
+                return method(*args, **kwargs)
+            finally:
+                signal.signal(signal.SIGINT, initial)
+        return inner
+
+    global _interrupt_handler
+    if _interrupt_handler is not None:
+        signal.signal(signal.SIGINT, _interrupt_handler.default_handler)